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The viscosity characteristics of dilute and concentrated solutions of Teflon-42 in acetone, DMF, DMAA, N-methylpyrrolidone, and trimethyl phosphate have been studied. Films based on Teflon-42 prepared by precipitation from concentrated aqueous solutions are investigated by IR spectroscopy and X-ray analysis. The analysis of intrinsic viscosity and viscosity of concentrated solutions shows that, with respect to Teflon-42, solvent quality changes in the following order: acetone > DMF > DMAA > trimethyl phosphate ≥ N-methylpyrrolidone. Films prepared from polymer solutions in various solvents are characterized by a highly crystalline structure (the degree of crystallinity is ~70%) that involves three polymorphic modifications.

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